-n --numeric-sort compare according to string numerical value 以纯数字排序 (默认以文本类型排序)
$ cat a
11
32
5
1
4
3
$ sort a
1
11
3
32
4
5
$ sort -n a
1
3
4
5
11
32
-u --unique 相同的数据中，仅出现一行
$ cat a
1
3
5
1
3
$ sort -u a
1
3
5 指定排序的区间
以冒号":"作为分隔符的第一个字段排序
head /etc/passwd root:x:0:0:root:/root:/bin/bash daemon:x:1:1:daemon:/usr/sbin:/bin/sh bin:x:2:2:bin:/bin:/bin/sh sys:x:3:3:sys:/dev:/bin/sh sync:x:4:65534:sync:/bin:/bin/sync games:x:5:60:games:/usr/games:/bin/sh man:x:6:12:man:/var/cache/man:/bin/sh lp:x:7:7:lp:/var/spool/lpd:/bin/sh mail:x:8:8:mail:/var/mail:/bin/sh news:x:9:9:news:/var/spool/news:/bin/sh $ head /etc/passwd| sort -t ":" -k 1 bin:x:2:2:bin:/bin:/bin/sh daemon:x:1:1:daemon:/usr/sbin:/bin/sh games:x:5:60:games:/usr/games:/bin/sh lp:x:7:7:lp:/var/spool/lpd:/bin/sh mail:x:8:8:mail:/var/mail:/bin/sh man:x:6:12:man:/var/cache/man:/bin/sh news:x:9:9:news:/var/spool/news:/bin/sh root:x:0:0:root:/root:/bin/bash sync:x:4:65534:sync:/bin:/bin/sync sys:x:3:3:sys:/dev:/bin/sh 以下这个例子可以看出-n的重要性了 $ cat a pa:11:a sa:32:c app:5:b stort:1:d pear:4:aa hello:3:f $ cat a |sort -t ":" -k 2 pa:11:a stort:1:d sa:32:c hello:3:f pear:4:aa app:5:b $ cat a |sort -t ":" -k 2 -n stort:1:d hello:3:f pear:4:aa app:5:b pa:11:a sa:32:c
原文地址：http://blog.csdn.net/u011402596/article/details/42532739
